Nothing changed in the sysctl.conf file, standard as it comes with the system.
This is the ifcfg-eth0 file
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=dhcp
HWADDR=xx:xx:xx:xx:xx:xx
IPV6INIT=yes
IPV6FORWARDING=yes
This is /etc/sysconfig/network:
NETWORKING=yes
HOSTNAME=localhost.localdomain
NETWORKING_IPV6=yes

Ugh, those ipv6 scripts are fun. After enough digging:
IPV6INIT and IPV6FORWARDING are global parameters - they can't be set
per-interface. That's what's causing the weird errors you see - if you set them
in /etc/sysconfig/network, it should behave.

Note

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